import Database from './db/Database';
import * as http from 'http';
import app from './app/app';


const db = Database.getInstance();

db.connect(() => {
    const port = normalizePort(process.env.PORT || '8080');
    app.set('port', port);

    const server = http.createServer(app);

    server.listen(port);
    server.on('error', onError);
    server.on('listening', onListening);

    /**
     * Normalize a port into a number, string, or false.
     */
    function normalizePort(val: string | number): number | string | false {
        const port = parseInt(val.toString(), 10);

        if (isNaN(port)) {
            // named pipe
            return val;
        }
        if (port >= 0) {
            // port number
            return port;
        }
        return false;
    }

    /**
     * Event listener for HTTP server "error" event.
     */
    function onError(error: NodeJS.ErrnoException): void {
        if (error.syscall !== 'listen') {
            throw error;
        }

        const bind = typeof port === 'string'
            ? 'Pipe ' + port
            : 'Port ' + port;

        // handle specific listen errors with friendly messages
        switch (error.code) {
            case 'EACCES':
                console.error(bind + ' requires elevated privileges');
                process.exit(1);
                break;
            case 'EADDRINUSE':
                console.error(bind + ' is already in use');
                process.exit(1);
                break;
            default:
                throw error;
        }
    }

    /**
     * Event listener for HTTP server "listening" event.
     */
    function onListening(): void {
        const addr = server.address();
        const bind = typeof addr === 'string'
            ? 'pipe ' + addr
            : 'port ' + (addr?.port ?? '');

        console.log('Listening on ' + bind);
    }
});
